A waveguide coupler includes a waveguide having a first and a second port, and a slot formed in a broadwall of the waveguide between the first and second ports, the slot centered on the first broadwall. A plurality of shifted waveguide sections are arranged between the first and second ports and extend along a length of the waveguide. A parallel-plate transmission line structure is coupled to the slot, wherein RF signals within one of the waveguide or the parallel-plate transmission line are communicated to the other of the waveguide and the parallel-plate transmission line through the slot.

The disclosed structures and methods are directed to antenna systems configured to transmit and receive a wireless signal in and from different directions. An antenna structure comprises a pair of horizontal-polarization (HP) antenna units forming a first parallel-plate waveguide. One of the HP antenna units and a base unit form a second parallel-plate waveguide. The antenna further comprises a pair of vertical-polarization (VP) antenna units each located in one of the first and second parallel-plate waveguides. Each HP antenna unit comprises inverted F antennas (IFAs) configured to radiate a radio-frequency (RF) waves that are horizontally polarized. Each VP antenna unit comprises VP excitation elements configured to radiate the RF waves that are vertically polarized. A method for manufacturing of the antenna structure is also disclosed.

A metal-only flat metasurface antenna is described. The antenna includes a pillbox beamformer combined with a metasurface structure provided by an array of non-resonant subwavelength unit elements having opening sizes that are strictly smaller than half of the guided-mode wavelength. The pillbox beamformer includes bottom and top parallel plate waveguides (PWPs) forming respective bottom and top cavities for propagation of the guided-mode. Bottom, middle and top metal plates form the two PWPs. Arranged at one end of the bottom and top PWPs is a respective parabolic structure. An all-metal horn structure is centrally arranged at a second end of the bottom PWP opposite the parabolic structure. According to one aspect, the horn structure includes a single feed port arranged at a focal point of the parabolic structure. According to another aspect, the horn structure includes two feed ports arranged at an offset of the focal point.

A metal-interference-resisting dipole antenna comprises a first metal plane, a second metal plane and a cable; the cable comprises an inner conductor, an insulation layer and an outer conductor, and the inner conductor comprises a first inner connecting end electrically connected to the first metal plane, and a second inner connecting end adapted for receiving the first feed signal; the insulation layer partly covers the inner conductor, wherein the outer conductor is disposed at the outer of the insulation layer corresponding to the inner conductor, and the outer conductor is electrically insulated from the inner conductor; the outer conductor has a first outer connecting end and a second outer connecting end, and the first outer connecting end is electrically connected to the second metal plane, and the second outer connecting end is adapted for receiving the second feed signal.

A waveguide coupler includes a waveguide having a first and a second port, and a slot formed in a broadwall of the waveguide between the first and second ports, the slot centered on the first broadwall. A plurality of shifted waveguide sections are arranged between the first and second ports and extend along a length of the waveguide. A parallel-plate transmission line structure is coupled to the slot, wherein RF signals within one of the waveguide or the parallel-plate transmission line are communicated to the other of the waveguide and the parallel-plate transmission line through the slot.

A parallel-plate diplexer includes a first parallel-plate transmission line and a second parallel-plate transmission line, a first end of the second parallel-plate transmission line including a first port and a second end of the second parallel-plate transmission line including a second port, and a first end of the first parallel-plate transmission line including a third port and a second end of the first parallel-plate transmission line being coupled to the second parallel-plate transmission line at a T-junction between the first port and the second port. The second parallel-plate transmission line includes a first parallel-plate transmission line tuning network located between the T-junction and the first port, and a second parallel-plate transmission line tuning network located between the T-junction and the second port.

A metal-interference-resisting dipole antenna comprises a first metal plane, a second metal plane and a cable; the cable comprises an inner conductor, an insulation layer and an outer conductor, and the inner conductor comprises a first inner connecting end electrically connected to the first metal plane, and a second inner connecting end adapted for receiving the first feed signal; the insulation layer partly covers the inner conductor, wherein the outer conductor is disposed at the outer of the insulation layer corresponding to the inner conductor, and the outer conductor is electrically insulated from the inner conductor; the outer conductor has a first outer connecting end and a second outer connecting end, and the first outer connecting end is electrically connected to the second metal plane, and the second outer connecting end is adapted for receiving the second feed signal.

In one scenario, a pillbox array is provided. The pillbox array includes a feed network unit that receives an input wave. The feed network unit includes feed branches for splitting and transmitting the input wave, pillbox reflectors that collimate the input wave, and radiating waveguides for radiating the collimated input wave. The pillbox array further includes a load plate mounted on the feed network unit, where the load plate has load elements placed between the radiating waveguides. This pillbox array also includes a polarizer plate that is mounted on the load plate and the feed network unit. The polarizer plate includes polarizers arranged such that when the polarizer plate is laterally shifted to a first side of the radiating waveguides, a first circular polarization occurs, and when the polarizer plate is laterally shifted to a second side of the radiating waveguides, a second circular polarization occurs.

A parallel-plate diplexer includes a first parallel-plate transmission line and a second parallel-plate transmission line, a first end of the second parallel-plate transmission line including a first port and a second end of the second parallel-plate transmission line including a second port, and a first end of the first parallel-plate transmission line including a third port and a second end of the first parallel-plate transmission line being coupled to the second parallel-plate transmission line at a T-junction between the first port and the second port. The second parallel-plate transmission line includes a first parallel-plate transmission line tuning network located between the T-junction and the first port, and a second parallel-plate transmission line tuning network located between the T-junction and the second port.

The present disclosure relates to radio engineering, and more specifically to high-frequency (HF) signal transmission/reception devices based on photoconductive switching elements. An HF signal transmission/reception device comprises a signal electrode with matching elements disposed along an edge thereof; a ground electrode, a dielectric layer between the signal electrode and the ground electrode, photoconductive elements (PE) each electrically connected to the signal electrode and the ground electrode and arranged in a grid, an excitation signal feed point, and load elements electrically connected to the matching elements. The photoconductive elements each have a switched-off state in the absence of a control light flux and a switched-on state in the presence of a control light flux, The switched-on photoconductive elements form a reflection profile of the signal supplied from the excitation signal feed point. The distance between adjacent photoconductive elements is less than half the wavelength of the excitation signal.